We only stayed 1 night but we were happy. Ben, an Australian from the Whitsundays was the concierge and gave us good advice on what to see and more importantly how to navigate the train system (easy once you get the hang of it). The rooms are not big but certainly not the smallest I have ever been in either. Relatively sound proof which was nice, as the Intercontinental in Yokohama wasn't, and we experienced what can only be described as "elephants on our roof" every morning as the people in the floor above got ready.
It is also very handy to Shinagawa Station.
I would stay there again.